1) Ability to specify drive letter for shared folders (I know this can be done manually in Windows)
2) Ability to share folder without assigning a letter (so someone can map a network drive in Windows to a letter of their choice, without also having Fusion map it to another letter, resulting in two drive letters pointing to the same thing)
3) Shared folders are slow. It would be great if there was some way to map NTFS partitions on the Mac to a drive letter in a VM, with near maximum speed. I'm guessing this would need to be done though a driver in Windows communicating with Fusion. Either that, or speed up shared folders (although the slow speed might be due to Windows)